fig4

Figure 4. (A) Possible positions of pyridine (N-6), graphite (N-Q), and pyridine (N-5) nitrogen in the carbon skeleton. Reproduced with permission^[80]. Copyright 2014, The Royal Society of Chemistry; (B) Preparation process of NMG; (C) SEM and (D) TEM image of NMG. Reproduced with permission^[81]. Copyright 2018, American Chemical Society; GCD curves for the first cycle and at different current rates for rGO800 (E) and rGO800-P (F); (G) Ragone plot of rGO800-P//AC LICs. Reproduced with permission^[82]. Copyright 2020, Wiley-VCH; (H) SEM and (I) TME image of NPG; (J) Construction of NPG//AC LICs. Reproduced with permission^[83]. Copyright 2019, Springer Nature; (K) Ragone plot of OMG-2//OMG-2 LICs; (L) The DFT calculation models after Li⁺ and $$\mathrm{PF}_{6}^{-}$$ absorption. Reproduced with permission^[137]. Copyright 2021, Elsevier B.V.